Question

Add / Subtract the following expression.

i) (3xy – 4yz + 9) + (4xy + 8yz – 19)

ii) (9x² + 8y² – 12) – (12y² – 3x² – 16)

iii) (12y² + 8z²y²) – (4y²z² + 14 – 2y²)

iv) (4abc – 4a²b² + 12) + (9a²b² – 9abc – 2b​

Answer 1

(1) (3xy - 4yz + 9) + (4xy + 8yz - 19)
= 3xy+4xy-4yz+8yz+9-19
= 7xy+4yz-10